/* * CDDL HEADER START * * The contents of this file are subject to the terms of the * Common Development and Distribution License (the "License"). * You may not use this file except in compliance with the License. * * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE * or http://www.opensolaris.org/os/licensing. * See the License for the specific language governing permissions * and limitations under the License. * * When distributing Covered Code, include this CDDL HEADER in each * file and include the License file at usr/src/OPENSOLARIS.LICENSE. * If applicable, add the following below this CDDL HEADER, with the * fields enclosed by brackets "[]" replaced with your own identifying * information: Portions Copyright [yyyy] [name of copyright owner] * * CDDL HEADER END */ /* * Copyright (C) 2011 Lawrence Livermore National Security, LLC. * Copyright (C) 2015 Jörg Thalheim. */ #ifndef _ZFS_VFS_H #define _ZFS_VFS_H #include #include #include /* * 2.6.28 API change, * Added insert_inode_locked() helper function, prior to this most callers * used insert_inode_hash(). The older method doesn't check for collisions * in the inode_hashtable but it still acceptible for use. */ #ifndef HAVE_INSERT_INODE_LOCKED static inline int insert_inode_locked(struct inode *ip) { insert_inode_hash(ip); return (0); } #endif /* HAVE_INSERT_INODE_LOCKED */ /* * 2.6.35 API change, * Add truncate_setsize() if it is not exported by the Linux kernel. * * Truncate the inode and pages associated with the inode. The pages are * unmapped and removed from cache. */ #ifndef HAVE_TRUNCATE_SETSIZE static inline void truncate_setsize(struct inode *ip, loff_t new) { struct address_space *mapping = ip->i_mapping; i_size_write(ip, new); unmap_mapping_range(mapping, new + PAGE_SIZE - 1, 0, 1); truncate_inode_pages(mapping, new); unmap_mapping_range(mapping, new + PAGE_SIZE - 1, 0, 1); } #endif /* HAVE_TRUNCATE_SETSIZE */ /* * 2.6.32 - 2.6.33, bdi_setup_and_register() is not available. * 2.6.34 - 3.19, bdi_setup_and_register() takes 3 arguments. * 4.0 - x.y, bdi_setup_and_register() takes 2 arguments. */ #if defined(HAVE_2ARGS_BDI_SETUP_AND_REGISTER) static inline int zpl_bdi_setup_and_register(struct backing_dev_info *bdi, char *name) { return (bdi_setup_and_register(bdi, name)); } #elif defined(HAVE_3ARGS_BDI_SETUP_AND_REGISTER) static inline int zpl_bdi_setup_and_register(struct backing_dev_info *bdi, char *name) { return (bdi_setup_and_register(bdi, name, BDI_CAP_MAP_COPY)); } #else extern atomic_long_t zfs_bdi_seq; static inline int zpl_bdi_setup_and_register(struct backing_dev_info *bdi, char *name) { char tmp[32]; int error; bdi->name = name; bdi->capabilities = BDI_CAP_MAP_COPY; error = bdi_init(bdi); if (error) return (error); sprintf(tmp, "%.28s%s", name, "-%d"); error = bdi_register(bdi, NULL, tmp, atomic_long_inc_return(&zfs_bdi_seq)); if (error) { bdi_destroy(bdi); return (error); } return (error); } #endif /* * 2.6.38 API change, * LOOKUP_RCU flag introduced to distinguish rcu-walk from ref-walk cases. */ #ifndef LOOKUP_RCU #define LOOKUP_RCU 0x0 #endif /* LOOKUP_RCU */ /* * 3.2-rc1 API change, * Add set_nlink() if it is not exported by the Linux kernel. * * i_nlink is read-only in Linux 3.2, but it can be set directly in * earlier kernels. */ #ifndef HAVE_SET_NLINK static inline void set_nlink(struct inode *inode, unsigned int nlink) { inode->i_nlink = nlink; } #endif /* HAVE_SET_NLINK */ /* * 3.3 API change, * The VFS .create, .mkdir and .mknod callbacks were updated to take a * umode_t type rather than an int. To cleanly handle both definitions * the zpl_umode_t type is introduced and set accordingly. */ #ifdef HAVE_MKDIR_UMODE_T typedef umode_t zpl_umode_t; #else typedef int zpl_umode_t; #endif /* * 3.5 API change, * The clear_inode() function replaces end_writeback() and introduces an * ordering change regarding when the inode_sync_wait() occurs. See the * configure check in config/kernel-clear-inode.m4 for full details. */ #if defined(HAVE_EVICT_INODE) && !defined(HAVE_CLEAR_INODE) #define clear_inode(ip) end_writeback(ip) #endif /* HAVE_EVICT_INODE && !HAVE_CLEAR_INODE */ /* * 3.6 API change, * The sget() helper function now takes the mount flags as an argument. */ #ifdef HAVE_5ARG_SGET #define zpl_sget(type, cmp, set, fl, mtd) sget(type, cmp, set, fl, mtd) #else #define zpl_sget(type, cmp, set, fl, mtd) sget(type, cmp, set, mtd) #endif /* HAVE_5ARG_SGET */ #if defined(SEEK_HOLE) && defined(SEEK_DATA) && !defined(HAVE_LSEEK_EXECUTE) static inline loff_t lseek_execute( struct file *filp, struct inode *inode, loff_t offset, loff_t maxsize) { if (offset < 0 && !(filp->f_mode & FMODE_UNSIGNED_OFFSET)) return (-EINVAL); if (offset > maxsize) return (-EINVAL); if (offset != filp->f_pos) { spin_lock(&filp->f_lock); filp->f_pos = offset; filp->f_version = 0; spin_unlock(&filp->f_lock); } return (offset); } #endif /* SEEK_HOLE && SEEK_DATA && !HAVE_LSEEK_EXECUTE */ #if defined(CONFIG_FS_POSIX_ACL) /* * These functions safely approximates the behavior of posix_acl_release() * which cannot be used because it calls the GPL-only symbol kfree_rcu(). * The in-kernel version, which can access the RCU, frees the ACLs after * the grace period expires. Because we're unsure how long that grace * period may be this implementation conservatively delays for 60 seconds. * This is several orders of magnitude larger than expected grace period. * At 60 seconds the kernel will also begin issuing RCU stall warnings. */ #include #if defined(HAVE_POSIX_ACL_RELEASE) && !defined(HAVE_POSIX_ACL_RELEASE_GPL_ONLY) #define zpl_posix_acl_release(arg) posix_acl_release(arg) #else void zpl_posix_acl_release_impl(struct posix_acl *); static inline void zpl_posix_acl_release(struct posix_acl *acl) { if ((acl == NULL) || (acl == ACL_NOT_CACHED)) return; if (atomic_dec_and_test(&acl->a_refcount)) zpl_posix_acl_release_impl(acl); } #endif /* HAVE_POSIX_ACL_RELEASE */ #ifdef HAVE_SET_CACHED_ACL_USABLE #define zpl_set_cached_acl(ip, ty, n) set_cached_acl(ip, ty, n) #define zpl_forget_cached_acl(ip, ty) forget_cached_acl(ip, ty) #else static inline void zpl_set_cached_acl(struct inode *ip, int type, struct posix_acl *newer) { struct posix_acl *older = NULL; spin_lock(&ip->i_lock); if ((newer != ACL_NOT_CACHED) && (newer != NULL)) posix_acl_dup(newer); switch (type) { case ACL_TYPE_ACCESS: older = ip->i_acl; rcu_assign_pointer(ip->i_acl, newer); break; case ACL_TYPE_DEFAULT: older = ip->i_default_acl; rcu_assign_pointer(ip->i_default_acl, newer); break; } spin_unlock(&ip->i_lock); zpl_posix_acl_release(older); } static inline void zpl_forget_cached_acl(struct inode *ip, int type) { zpl_set_cached_acl(ip, type, (struct posix_acl *)ACL_NOT_CACHED); } #endif /* HAVE_SET_CACHED_ACL_USABLE */ #ifndef HAVE___POSIX_ACL_CHMOD #ifdef HAVE_POSIX_ACL_CHMOD #define __posix_acl_chmod(acl, gfp, mode) posix_acl_chmod(acl, gfp, mode) #define __posix_acl_create(acl, gfp, mode) posix_acl_create(acl, gfp, mode) #else static inline int __posix_acl_chmod(struct posix_acl **acl, int flags, umode_t umode) { struct posix_acl *oldacl = *acl; mode_t mode = umode; int error; *acl = posix_acl_clone(*acl, flags); zpl_posix_acl_release(oldacl); if (!(*acl)) return (-ENOMEM); error = posix_acl_chmod_masq(*acl, mode); if (error) { zpl_posix_acl_release(*acl); *acl = NULL; } return (error); } static inline int __posix_acl_create(struct posix_acl **acl, int flags, umode_t *umodep) { struct posix_acl *oldacl = *acl; mode_t mode = *umodep; int error; *acl = posix_acl_clone(*acl, flags); zpl_posix_acl_release(oldacl); if (!(*acl)) return (-ENOMEM); error = posix_acl_create_masq(*acl, &mode); *umodep = mode; if (error < 0) { zpl_posix_acl_release(*acl); *acl = NULL; } return (error); } #endif /* HAVE_POSIX_ACL_CHMOD */ #endif /* HAVE___POSIX_ACL_CHMOD */ #ifdef HAVE_POSIX_ACL_EQUIV_MODE_UMODE_T typedef umode_t zpl_equivmode_t; #else typedef mode_t zpl_equivmode_t; #endif /* HAVE_POSIX_ACL_EQUIV_MODE_UMODE_T */ /* * 4.8 API change, * posix_acl_valid() now must be passed a namespace, the namespace from * from super block associated with the given inode is used for this purpose. */ #ifdef HAVE_POSIX_ACL_VALID_WITH_NS #define zpl_posix_acl_valid(ip, acl) posix_acl_valid(ip->i_sb->s_user_ns, acl) #else #define zpl_posix_acl_valid(ip, acl) posix_acl_valid(acl) #endif #endif /* CONFIG_FS_POSIX_ACL */ /* * 2.6.38 API change, * The is_owner_or_cap() function was renamed to inode_owner_or_capable(). */ #ifdef HAVE_INODE_OWNER_OR_CAPABLE #define zpl_inode_owner_or_capable(ip) inode_owner_or_capable(ip) #else #define zpl_inode_owner_or_capable(ip) is_owner_or_cap(ip) #endif /* HAVE_INODE_OWNER_OR_CAPABLE */ /* * 3.19 API change * struct access f->f_dentry->d_inode was replaced by accessor function * file_inode(f) */ #ifndef HAVE_FILE_INODE static inline struct inode *file_inode(const struct file *f) { return (f->f_dentry->d_inode); } #endif /* HAVE_FILE_INODE */ /* * 4.1 API change * struct access file->f_path.dentry was replaced by accessor function * file_dentry(f) */ #ifndef HAVE_FILE_DENTRY static inline struct dentry *file_dentry(const struct file *f) { return (f->f_path.dentry); } #endif /* HAVE_FILE_DENTRY */ #ifdef HAVE_KUID_HELPERS static inline uid_t zfs_uid_read_impl(struct inode *ip) { #ifdef HAVE_SUPER_USER_NS return (from_kuid(ip->i_sb->s_user_ns, ip->i_uid)); #else return (from_kuid(kcred->user_ns, ip->i_uid)); #endif } static inline uid_t zfs_uid_read(struct inode *ip) { return (zfs_uid_read_impl(ip)); } static inline gid_t zfs_gid_read_impl(struct inode *ip) { #ifdef HAVE_SUPER_USER_NS return (from_kgid(ip->i_sb->s_user_ns, ip->i_gid)); #else return (from_kgid(kcred->user_ns, ip->i_gid)); #endif } static inline gid_t zfs_gid_read(struct inode *ip) { return (zfs_gid_read_impl(ip)); } static inline void zfs_uid_write(struct inode *ip, uid_t uid) { #ifdef HAVE_SUPER_USER_NS ip->i_uid = make_kuid(ip->i_sb->s_user_ns, uid); #else ip->i_uid = make_kuid(kcred->user_ns, uid); #endif } static inline void zfs_gid_write(struct inode *ip, gid_t gid) { #ifdef HAVE_SUPER_USER_NS ip->i_gid = make_kgid(ip->i_sb->s_user_ns, gid); #else ip->i_gid = make_kgid(kcred->user_ns, gid); #endif } #else static inline uid_t zfs_uid_read(struct inode *ip) { return (ip->i_uid); } static inline gid_t zfs_gid_read(struct inode *ip) { return (ip->i_gid); } static inline void zfs_uid_write(struct inode *ip, uid_t uid) { ip->i_uid = uid; } static inline void zfs_gid_write(struct inode *ip, gid_t gid) { ip->i_gid = gid; } #endif /* * 2.6.38 API change */ #ifdef HAVE_FOLLOW_DOWN_ONE #define zpl_follow_down_one(path) follow_down_one(path) #define zpl_follow_up(path) follow_up(path) #else #define zpl_follow_down_one(path) follow_down(path) #define zpl_follow_up(path) follow_up(path) #endif /* * 4.9 API change */ #ifndef HAVE_SETATTR_PREPARE static inline int setattr_prepare(struct dentry *dentry, struct iattr *ia) { return (inode_change_ok(dentry->d_inode, ia)); } #endif #endif /* _ZFS_VFS_H */